Mick pointed out the need for a good engineer and producer.

The engineer will hear mistakes that cannot be corrected in the final mix and make a call on the spot of whether to start again, keep going and then redo the offending stanza or know it is correctable in the final mix and let it go until later.

Part of a producer's job is to ensure that the mixture of songs is good and then decide the order of songs/pieces on the CD. The recording artist should be in on both mixing and mastering sessions. With no offense meant to anyone, it's your decision as a recording artist to yea or nay a given track or tracks. If your producer is not on board with your wishes, get another producer. Opinions are free as is advice. But at the end of the day the product will have your name on it in big letters, and the producer and engineer's will be on it in small letters. It's your reputation on the line, and because it is, you will have some hard decisions to make. Make 'em.